Don't forget you can always rent furniture, like from Cort, or go with a fully furnished apartment. Definitely, definitely go through your stuff and SORT before you pack. I have gotten rid of so much - bags and boxes, trunkloads, of stuff to the thrift store - and it doesn't seem to have made a dent. I really don't miss any of it. And we only live in a 2BR apt with a small storage space outside.
If you need help deciding, just do the simply math.
Moving estimate example: 11,000lbs about $6,000 with me packing books and CDs
+ rent at the new apartment
+ time to pack, unpack for me
OR
Moving estimate
+ storage costs for one year for x-amount of storage (with or with A/C)
+ rent for apt (furnished, rent furniture, or minimal own things)
Take either scenario and then add:
the cost of the second move
+/- the final cost of your old home when it sells, including how much of a hit you can afford to take, if it sells under current market value.
It all may sound like alot, but that's really where the hard part is, and once you get that figured out a bit more in your head, the answer will begin to become more apparent to you. Maybe it will help if you can imagine the different scenarios, and see which ones you may regret more and go for the opposite?? (Coin Toss psychology: "aww, it's tails..")
Good luck with whatever you decide!